[Solved] Did your AJAX Extensions damged?

[Duy]

i used  radgrid  for asp.net ajax in default.aspx and built success. But  when it was running in browser , it was appear error :

System.MissingMethodException: Method not found: 'Void System.Web.UI.ScriptManager.RegisterStartupScript(System.Web.UI.Page, System.Type, System.String, System.String, Boolean)'.

That is error by my ajax entensions ?
I am using version trial.

[Vlad]

Hello Duy,

Please download latest Microsoft ASP.NET AJAX to correct this.

All the best,
Vlad
the Telerik team

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[Duy]

i must ajax1.0 or ajax3.5 ?